27-CONTENTS
GUN Page 30 May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
CHAPTER 27 - FLIGHT CONTROLS
TABLE OF CONTENTS
_________________
Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
Adjustment/Test 501 ALL
Adjustment/Test of the 501
Position Indicating System
for the LE Slat
TRANSMITTER - LEADING EDGE SLAT 27-88-01 POSITION Removal/Installation 401 ALL
27-CONTENTS
GUN Page 31 May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
FLIGHT CONTROLS - DESCRIPTION AND OPERATION
___________________________________________
1. General (Fig. 1)_______
A. Aerodynamic characteristics of the 757 have been tailored to reduce drag and provide high performance. Single leading edge slats and trailing edge flaps are used for high aerodynamic efficiency, functional reliability, and low maintenance requirements. Hydraulically powered conventional flight controls with redundant systems provide fail-safe control throughout the flight envelope.
2. Introduction (Fig. 2)____________
A. Primary Flight Controls
(1)
The primary flight controls of the airplane are the ailerons, elevators, and rudder. Each control surface is powered by power control actuators (PCA's) that are cable operated. Each PCA receives hydraulic power from a separate hydraulic system. The primary flight controls use all three hydraulic systems for redundancy. There is no reversion to manual control of the surfaces if hydraulic power fails.
B.
Secondary Flight Controls
(1)
The secondary flight controls are the spoiler/speedbrakes, horizontal stabilizer, leading edge (LE) slats, and trailing edge (TE) flaps.
(2)
Six spoiler/speedbrakes are installed on each wing. They are hydraulically powered and electronically controlled. The spoiler/speedbrakes receive hydraulic power from all three hydraulic systems.
(3)
Five LE slats are installed on each wing. The slats are powered either hydraulically or electrically. Normally, hydraulic motors rotate drive shafts that drive the rotary actuators. Electric motors power the drive shafts as a backup. The slats receive hydraulic power from the left system.
(4)
Two TE flaps (inboard and outboard) are installed on each wing. The flaps are powered either hydraulically or electrically. Normally, hydraulic motors rotate drive shafts that drive rotary actuators. Electric motors power the drive shafts as a backup. The flaps receive hydraulic power from the left system.
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27-00-00
ALL ú ú 02 Page 1 ú Jan 28/01
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A
757
MAINTENANCE MANUAL
ELEVATOR
HORIZONTAL STABILIZER
Flight Controls Introduction Figure 1
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757 MAINTENANCE MANUAL
LEFT HYD SYS CENTER HYD SYS RIGHT HYD SYS
HYD DRIVEN PUMPS
ENG DRIVEN HYD PUMPS AC MOTOR PUMPS POWER TRANSFER UNIT RAM AIR TURBINE
TAIL SHUTOFF VALVES
SPOILER POWER CONTROL ACTUATORS
AILERON PCA
STABILIZER TRIM
ELEVATOR AUTOPILOT
SERVOS
ELEVATOR FEEL COMPUTER
ELEVATOR PCA
DIRECTIONAL AUTOPILOT SERVOS
RUDDER PCA
YAW DAMPER SERVOS
RUDDER RATIO CHANGER
Flight Control - Hydraulic Distribution
Figure 2
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